<template>
    <div class="com-container">
        <div class="title" :style="comStyle">
            <span>{{ '▎ ' + showTitle }}</span>
            <span class="iconfont title-icon" :style="comStyle" @click="showChoice = !showChoice">&#xe6eb;</span>
            <div class="select-con" v-show="showChoice" :style="marginStyle">
                <div class="select-item" v-for="item in selectTypes" :key="item.key" @click="handleSelect(item.key)">
                    {{ item.text }}
                </div>
            </div>
        </div>
        <div class="com-chart" ref="trend_ref"></div>
    </div>
</template>

<script>
import { getThemeValue } from '../utils/theme_utils'
import { mapState } from 'vuex'
export default {
    data() {
        return {
            chartInstane: null,
            allData: null, // 从服务器中获取的所有数据
            showChoice: false, // 是否显示可选项
            choiceType: 'map', // 显示的数据类型
            titleFontSize: 16 // 指明标题的字体大小
        }
    },
    computed: {
        selectTypes() {
            if (!this.allData) {
                return []
            } else {
                return this.allData.type.filter(item => {
                    return item.key !== this.choiceType
                })
            }
        },
        showTitle() {
            if (!this.allData) {
                return ''
            } else {
                return this.allData[this.choiceType].title
            }
        },
        // 设置给标题的样式
        comStyle() {
            return {
                fontSize: this.titleFontSize + 'px',
                color: getThemeValue(this.theme).titleColor
            }
        },
        marginStyle() {
            return {
                marginLeft: this.titleFontSize + 'px'
            }
        },
        ...mapState(['theme'])
    },
    created() {
        this.$socket.registerCallBack('trendData', this.getData)
    },
    mounted() {
        this.initChart()
        this.$socket.send({
            action: 'getData',
            socketType: 'trendData',
            chartName: 'trend',
            value: '',
        })
        window.addEventListener('resize', this.screenAdapt)
        this.screenAdapt()
    },
    destroyed() {
        window.removeEventListener('resize', this.screenAdapt)
        this.$socket.unRegisterCallBack('trendData')
    },
    methods: {
        handleSelect(currentType) {
            this.choiceType = currentType
            this.updateChart()
            this.showChoice = false
        },
        initChart() {
            this.chartInstane = this.$echarts.init(this.$refs.trend_ref, this.theme)
            const initOption = {
                xAxis: {
                    type: 'category',
                    boundaryGap: false
                },
                yAxis: {
                    type: 'value'
                },
                grid: {
                    left: '3%',
                    top: '35%',
                    right: '4%',
                    bottom: '1%',
                    containLabel: true
                },
                tooltip: {
                    trigger: 'axis'
                },
                legend: {
                    left: 20,
                    top: '15%',
                    icon: 'circle'
                },
            }
            this.chartInstane.setOption(initOption)
        },
        getData(ret) {
            // const {data:ret} = await this.$http.get('trend')
            this.allData = ret
            this.updateChart()
        },
        updateChart() {
            const colorArr1 = [
                'rgba(11, 168, 44, 0.5)',
                'rgba(44, 110, 255, 0.5)',
                'rgba(22, 242, 217, 0.5)',
                'rgba(254, 33, 30, 0.5)',
                'rgba(250, 105, 0, 0.5)'
            ]
            // 全透明的颜色值
            const colorArr2 = [
                'rgba(11, 168, 44, 0)',
                'rgba(44, 110, 255, 0)',
                'rgba(22, 242, 217, 0)',
                'rgba(254, 33, 30, 0)',
                'rgba(250, 105, 0, 0)'
            ]
            const timeArr = this.allData.common.month
            const valueArr = this.allData[this.choiceType].data
            const seriesArr = valueArr.map((item, index) => {
                return {
                    name: item.name,
                    type: 'line',
                    data: item.data,
                    stack: this.choiceType,
                    areaStyle: {
                        color: new this.$echarts.graphic.LinearGradient(0, 0, 0, 1, [
                            {
                                offset: 0,
                                color: colorArr1[index]
                            }, // %0的颜色值
                            {
                                offset: 1,
                                color: colorArr2[index]
                            } // 100%的颜色值
                        ])
                    }
                }
            })
            const legendArr = valueArr.map(item => {
                return item.name
            })
            const dataOption = {
                xAxis: {
                    data: timeArr
                },
                legend: {
                    data: legendArr
                },
                series: seriesArr
            }
            this.chartInstane.setOption(dataOption)
        },
        screenAdapt() {
            this.titleFontSize = this.$refs.trend_ref.offsetWidth / 100 * 3.6
            const adapterOption = {
                legend: {
                    itemWidth: this.titleFontSize,
                    itemHeight: this.titleFontSize,
                    itemGap: this.titleFontSize,
                    textStyle: {
                        fontSize: this.titleFontSize / 2
                    }
                }
            }
            this.chartInstane.setOption(adapterOption)
            this.chartInstane.resize()
        }
    },
    watch: {
        theme() {
            this.chartInstane.dispose() // 销毁当前的图表
            this.initChart() // 重新以最新的主题名称初始化图表对象
            this.screenAdapter() // 完成屏幕的适配
            this.updateChart() // 更新图表的展示
        }
    }

}
</script>

<style lang="less" scoped>
.title {
    position: absolute;
    left: 20px;
    top: 20px;
    z-index: 10;
    color: white;

    .title-icon {
        margin-left: 10px;
        cursor: pointer;
    }

    .select-con {
        background-color: #222733;
    }
}
</style>
